leetcode PowerofThree
z
 2019-04-09 10:36:27   
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public class PowerofThree {
  /**
   * Given an integer, write a function to determine if it is a power of three.
   *
   * Example 1:
   *
   * Input: 27
   * Output: true
   * Example 2:
   *
   * Input: 0
   * Output: false
   * Example 3:
   *
   * Input: 9
   * Output: true
   * Example 4:
   *
   * Input: 45
   * Output: false
   * Follow up:
   * Could you do it without using any loop / recursion?
   */
  public boolean isPowerOfThree(int n) {
    return true;
  }
}